<template>
  <div>
    <el-switch v-model="draggable" active-text="开启拖拽" inactive-text="关闭拖拽"></el-switch>
    <el-button v-if="draggable" @click="batchSave">批量保存</el-button>
    <el-button type="danger" @click="batchDelete">批量删除</el-button>

    <el-tree :data="menus" :props="defaultProps"
             show-checkbox
             :default-expanded-keys="expandedKey"
             :draggable="draggable"
             :allow-drop="allowDrop"
             @node-drop="handleDrop"
             ref="menuTree"
             :expand-on-click-node="false" node-key="catId">
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span class="buttn">
          <el-button v-if="data.catLevel==1 || data.catLevel==2" type="text" size="mini" @click="() => append(data)">添加</el-button>

          <el-button v-if="node.childNodes.length==0 " type="text" size="mini" @click="() => remove(node, data)">删除
          </el-button>
          <el-button type="text" size="mini" @click="edit(data)">修改</el-button>
        </span>
      </span>
    </el-tree>

    <el-dialog
      :title="title"
      :visible.sync="dialogVisible"
      width="30%"
    >
      <el-form :model="category" v-if="isShow">
        <el-form-item label="分类名称">
          <el-input type="text" v-model="category.name"></el-input>
          {{category.name}}
        </el-form-item>
        <el-form-item label="图标">
          <el-input v-model="category.icon"></el-input>
        </el-form-item>
        <el-form-item label="计量单位">
          <el-input v-model="category.productCount" autocomplete="off"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
    <el-button @click="dialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="upaddcategory">确 定</el-button>
  </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        pCid: [],
        draggable: false,
        updateNodes: [],
        maxLevel: 0,
        title: "",
        dialogType: "", //edit,add
        category: {
          name: "",
          parentCid: 0,
          catLevel: 0,
          showStatus: 1,
          sort: 0,
          productUnit: "",
          icon: "",
          catId: null
        },
        isShow: true,
        dialogVisible: false,
        menus: [],
        expandedKey: [],
        defaultProps: {
          children: "children",
          label: "name"
        }
      };
    },
    methods: {
      handleNodeClick(data) {
        console.log(data);
      },

      getMenus() {
        console.log("执行了")
        this.$http({
          url: this.$http.adornUrl('/product/category/list/tree'),
          method: 'get'
        }).then(data => {
            this.menus = data.data.data
            console.log("成功获取到菜单数据，", this.menus)
          }
        )
      },


      allowDrop(draggingNode, dropNode, type) {
        //1、被拖动的当前节点以及所在的父节点总层数不能大于3

        //1）、被拖动的当前节点总层数
        console.log("allowDrop:", draggingNode, dropNode, type);
        //
        this.countNodeLevel(draggingNode);
        //当前正在拖动的节点+父节点所在的深度不大于3即可
        let deep = Math.abs(this.maxLevel - draggingNode.level) + 1;
        console.log("深度：", deep);

        //   this.maxLevel
        if (type == "inner") {
          // console.log(
          //   `this.maxLevel：${this.maxLevel}；draggingNode.data.catLevel：${draggingNode.data.catLevel}；dropNode.level：${dropNode.level}`
          // );
          return deep + dropNode.level <= 3;
        } else {
          return deep + dropNode.parent.level <= 3;
        }
      },
      countNodeLevel(node) {
        //找到所有子节点，求出最大深度
        if (node.childNodes != null && node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            if (node.childNodes[i].level > this.maxLevel) {
              this.maxLevel = node.childNodes[i].level;
            }
            this.countNodeLevel(node.childNodes[i]);
          }
        }
      },

      handleDrop(draggingNode, dropNode, dropType, ev) {
        console.log("handleDrop: ", draggingNode, dropNode, dropType);
        //1、当前节点最新的父节点id
        let pCid = 0;
        let siblings = null;
        if (dropType == "before" || dropType == "after") {
          pCid = dropNode.parent.data.catId == undefined ? 0 : dropNode.parent.data.catId;
          siblings = dropNode.parent.childNodes;
        } else {
          pCid = dropNode.data.catId;
          siblings = dropNode.childNodes;
        }
        this.pCid.push(pCid);

        //2、当前拖拽节点的最新顺序，
        for (let i = 0; i < siblings.length; i++) {
          if (siblings[i].data.catId == draggingNode.data.catId) {
            //如果遍历的是当前正在拖拽的节点
            let catLevel = draggingNode.level;
            if (siblings[i].level != draggingNode.level) {
              //当前节点的层级发生变化
              catLevel = siblings[i].level;
              //修改他子节点的层级
              this.updateChildNodeLevel(siblings[i]);
            }
            this.updateNodes.push({catId: siblings[i].data.catId, sort: i, parentCid: pCid, catLevel: catLevel
            });
          } else {
            this.updateNodes.push({catId: siblings[i].data.catId, sort: i});
          }
        }

        //3、当前拖拽节点的最新层级
        console.log("updateNodes", this.updateNodes);

      },

      updateChildNodeLevel(node) {
        if (node.childNodes.length > 0) {
          for (let i = 0; i < node.childNodes.length; i++) {
            var cNode = node.childNodes[i].data;
            this.updateNodes.push({catId: cNode.catId, catLevel: node.childNodes[i].level});
            this.updateChildNodeLevel(node.childNodes[i]);
          }
        }
      },
        //拖拽保存
      batchSave() {
        this.$http({
          url: this.$http.adornUrl("/product/category/update/sort"),
          method: "post",
          data: this.$http.adornData(this.updateNodes, false)
        }).then(({data}) => {
          this.$message({
            message: "菜单顺序等修改成功",
            type: "success"
          });
          //刷新出新的菜单
          this.getMenus();
          //设置需要默认展开的菜单
          this.expandedKey = this.pCid;
          this.updateNodes = [];
          this.maxLevel = 0;
          // this.pCid = 0;
        });
      },
      batchDelete() {
        let catIds = [];
        let checkedNodes = this.$refs.menuTree.getCheckedNodes();
        console.log("被选中的元素", checkedNodes);
        for (let i = 0; i < checkedNodes.length; i++) {
          catIds.push(checkedNodes[i].catId);
        }
        this.$confirm(`是否批量删除【${catIds}】菜单?`, "提示", {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        })
          .then(() => {
            this.$http({
              url: this.$http.adornUrl("/product/category/delete"),
              method: "post",
              data: this.$http.adornData(catIds, false)
            }).then(({data}) => {
              this.$message({
                message: "菜单批量删除成功",
                type: "success"
              });
              this.getMenus();
            });
          })
          .catch(() => {
          });
      },

      edit(data) {
        this.isShow = false;
        console.log("要修改的数据", data);
        this.title = "修改分类";
        this.dialogVisible = true;

        this.$http({
          url: this.$http.adornUrl(`/product/category/info/${data.catId}`),
          method: "get"
        }).then(({data}) => {
          this.isShow = true;
          // 在 $nextTick 回调中修改表单的值
          console.log("要回显的数据", data);
          this.category.name = data.category.name;
          console.log("要回显的数据name", data.category.name);
          this.category.catId = data.category.catId;
          this.category.icon = data.category.icon;
          this.category.productUnit = data.category.productUnit;
          this.category.productCount = data.category.productCount;
          this.category.parentCid = data.category.parentCid;
          this.category.catLevel = data.category.catLevel;
          this.category.sort = data.category.sort;
          this.category.showStatus = data.category.showStatus;
        });
      },

      append(data) {
        this.dialogVisible = true;
        this.title = '添加提示'
        this.category = {};
        console.log("data为", data)
        this.category.parentCid = data.catId
        this.category.catLevel = data.catLevel + 1
        this.category.showStatus = 1
      },
      upaddcategory() {
        if (this.category.catId == 0 || this.category.catId == null) {
          this.addcategory()
        } else {
          this.editcategory()
        }
      },

      //添加
      addcategory() {
        this.$http({
          url: this.$http.adornUrl('/product/category/save'),
          method: 'post',
          data: this.$http.adornData(this.category, false)
        }).then(({data}) => {
          this.$message({
            type: 'success',
            message: '添加成功!'
          });
          this.getMenus();
          this.expandedKey = [this.category.parentCid]
          this.dialogVisible = false
          this.category = {};
        })
      },
      //修改
      editcategory() {
        let obj = {
          name: this.category.name,
          icon: this.category.icon,
          catId: this.category.catId,
          productCount: this.category.productCount
        };
        this.$http({
          url: this.$http.adornUrl('/product/category/update'),
          method: 'post',
          data: this.$http.adornData(obj, false)
        }).then(({data}) => {
          this.$message({
            type: 'success',
            message: '修改成功!'
          });
          this.getMenus();
          this.expandedKey = [this.category.parentCid]
          this.dialogVisible = false
          this.category = {};
        })
      },


      remove(node, data) {
        console.log("node, data", node, data)
        this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          var ids = [data.catId];
          this.$http({
            url: this.$http.adornUrl('/product/category/delete'),
            method: 'post',
            data: this.$http.adornData(ids, false)
          }).then(({data}) => {
            this.$message({
              type: 'success',
              message: '删除成功!'
            });
            this.getMenus();
            this.expandedKey = [node.parent.data.catId]
          })


        }).catch(() => {
        });


      },

    },
    created() {
      this.getMenus()
    },
  }
</script>

<style>
  .buttn {

  }
</style>
